.img-vertical {    
    max-width: 600px;
    height: auto;
}

.img-horizontal {
    max-width: 800px;
    height: auto;
}

.large-margin {
    margin: 2em;
}

.no-gaps {
    margin: 0 !important;
    padding: 0;
}

.grayscale-thumb {
    transition: transform .5s, filter .5s ease-in-out;
    filter: grayscale(100%);
    width: 200px;
}

.grayscale-thumb:hover {
    filter: grayscale(0);
    transform: scale(1.03);
}

.figure-caption {
    font-size: 1.5em;
}

.accordion {
    cursor: pointer;
    padding: 0px;
    width: 100%;
    border: none;
    justify-content: flex-start;
    outline: none;
    font-size: 15px;
    transition: 0.4s;
}

.accordion-panel {
    padding: 0 18px;
    display: none;
    overflow: hidden;
}